On May 27, 1:42 pm, Frederick Cheung <frederick.che...@gmail.com>
wrote:
> On May 27, 9:35 am, Vipin <sh.vi...@gmail.com> wrote:
>
> > Looking for suggestions on following two queries.
>
> > Query 1
> > ------------------------------
> > Are the two following lines of code different in Ruby / Rails ( in a
> > *.html.erb) file.
> > <% if @forms.count != 0 %> <!-- first code -->
> > Vs.
> > <% if @forms.count %> <!--second code -->
>
> > @forms is an array of objects. Coming from "C" language development
> > background, i thought they should be the same. FYI, second code
> > doesn't give any error but still gets evaluated to TRUE. I confirmed
> > by doing puts @forms.count in controller
>
> They are different. in ruby, 0 has the logical value true (only nil
> and false have the logical value false)
>
>
>
> > Query 2
> > ------------------------
> > which one is preferred
> > @forms. count or @forms.size
> > @forms is an array.
>
> if forms is actually an array, forms.count doesn't exist (but it does
> if it is an association proxy, eg person.friends).
>
> Fred
>
> > thanks
> > vipin
Thanks Fred.
so basically, I must use
<% if @forms.count != 0 %>
and about second point also, yes i got it through association only.
Also found that it doesn't have count method.
I hope it is safe to use.
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